#include <iostream>
using namespace std;
int main()
{
    int n, left = 0, right = 0, a = 1, now = 1, ans = 0;
    scanf("%d", &n);
    while (n / a)
    {
        left = n / (a * 10), now = n / a % 10, right = n % a;
        if (now == 0)
            ans += left * a;
        else if (now == 1)
            ans += left * a + right + 1;
        else
            ans += (left + 1) * a;
        a = a * 10;
    }
    printf("%d", ans);
    return 0;
}